Hot Dip Galvanizing

Hot dip galvanizing takes place by carefully cleaning the component by pickling in hydrochloric or sulfuric acid, or by mechanical cleaning, such as sand blasting, and then dipping it in molten zinc.

In hot dip galvanizing of steel oxides that may have formed after the first cleaning must be removed before dipping. In a dry method, the part is dipped in a flux, usually a solution of zinc ammonium chloride, and allowed to dry before dipping it in the zinc bath. In a wet method the surface of the molten zinc is covered with flux and the workpiece passes through the flux when being dipped. The zinc should normally hold 450 to 475 °C and the immersion time is usually between 10 and 30 s.

Ref. Karlebo Handbok

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